| 摘要 |
PROBLEM TO BE SOLVED: To provide an overheat protection circuit capable of preventing malfunction when a negative current is applied to the output end of a monitored power element.SOLUTION: An overheat protection circuit has an NPN transistor Q1, a power supply terminal 1 on which a power supply voltage Vis applied, a transmission path for transmitting the power supply voltage Vto the collector of the NPN transistor Q1 from the power supply terminal 1 not through a current source, and an output voltage generating section (an operational amplifier 3, a buffer 4) generating an output voltage Vdepending on the base-emitter voltage of the NPN transistor Q1.SELECTED DRAWING: Figure 1 |
